The season started in September 2017 and ended in May 2018 with the promotion playoffs to LEB Plata.
The winner of this single-legged series will host one of the four groups of the final stage.
The game was played on 5 May at the Pabellón de A Raña in Marín.
Runner-up and third place game winner qualified for the final stage.
The first qualified teams will host the groups, played with a round-robin format.